8177

• UCREFRP Catalog Number: 8177
• Author: Valdez, R. A., B. R. Cowdell and L. Lentsch.
• Title: Overwinter Survival of Age-0 Colorado Pikeminnow in the Green River, Utah, 1987-1995\
• USFW Year: 1999.
• Copyright Material: NO

Table 5. Geometric mean CPUE (No.l100 m2) for backwaters with different mean depths
during fall and spring, 1987-92, in the lower Green River (Reach 3, RK 0-193).
Asterisks denote significant differences (Students 't', P<0.05) between fall and spring
mean CPUEs.
Backwater Depth Sampling Period No. Backwaters CPUE (standard Percent Decrease
deviation) In Mean CPUE
<30 cm Fall 53 2.97 (3.85)
Spring 30 0.52 (1.36)* 82
30-60 em Fall 255 6.61 (6.42)
Spring 179 2.94 (4.90)* 56
60-90 em Fall 68 8.12 (5.00)
Spring 71 4.69 (5.99)* 42
90-120 em Fall 24 12.46 (8.08)
Spring 33 6.24 (3.57)* 50
> 120 em Fall 38 9.17 (5.64)
Spring 20 7.76 (4.01) 15

80

70

ctl
>
.- 60
C:
:;J
~ 50
c:
CJ)
~ 40
Q)
a..
30

20
20

Figure 6.

Y = 10.038 + 0.546 X
r squ = 0.744
P = OA17

.

.

.

40 60 80 100
Average Backwater Depth

120

Survival of age-O Colorado pikeminnow in backwaters with different average depths.

15